<script setup>
  import { ref } from 'vue'
  import { Plus, Upload } from '@element-plus/icons-vue'
  import { useUserStore } from '@/stores'
  import { userUpdateAvatarService } from '@/api/user'
  const userStore = useUserStore()
  const loading = ref(false)
  const imgUrl = ref(userStore.userInfo.user_pic)
  const uploadRef = ref()
  const onSelectFile = (uploadFile) => {
    // 基于createObjectURL预览图片
    // imgUrl.value = URL.createObjectURL(uploadFile.raw)

    // 基于 FileReader 读取图片做预览,并将图片转换为base64编码
    const reader = new FileReader()
    reader.readAsDataURL(uploadFile.raw)
    reader.onload = () => {
      imgUrl.value = reader.result
    }
  }

  const onUpdateAvatar = async () => {
    loading.value = true
    // 发送请求更新头像
    await userUpdateAvatarService(imgUrl.value)
    // userStore 重新渲染
    await userStore.getUserInfo()
    loading.value = false
    // 提示用户
    ElMessage.success('头像更新成功')
  }
</script>

<template>
  <page-container title="更换头像" v-loading="loading">
    <el-upload
      ref="uploadRef"
      :auto-upload="false"
      class="avatar-uploader"
      :show-file-list="false"
      :on-change="onSelectFile"
    >
      <img v-if="imgUrl" :src="imgUrl" class="avatar" />
      <el-icon v-else class="avatar-uploader-icon"><Plus /></el-icon>
    </el-upload>

    <br />
    <!-- el-upload本质是input -->
    <el-button
      @click="uploadRef.$el.querySelector('input').click()"
      type="primary"
      :icon="Plus"
      size="large"
      style="margin-right: 30px"
      >选择图片</el-button
    >
    <el-button @click="onUpdateAvatar" type="success" :icon="Upload" size="large"
      >上传头像</el-button
    >
  </page-container>
</template>

<style lang="scss" scoped>
  .avatar-uploader {
    :deep() {
      .avatar {
        width: 278px;
        height: 278px;
        display: block;
      }
      .el-upload {
        border: 1px dashed var(--el-border-color);
        border-radius: 6px;
        cursor: pointer;
        position: relative;
        overflow: hidden;
        transition: var(--el-transition-duration-fast);
      }
      .el-upload:hover {
        border-color: var(--el-color-primary);
      }
      .el-icon.avatar-uploader-icon {
        font-size: 28px;
        color: #8c939d;
        width: 278px;
        height: 278px;
        text-align: center;
      }
    }
  }
</style>
